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Dave is Chief of the National Geologic Map Database project,...
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Puerto Rico and U.S. Virgin Islands were mapped at 1:20,000,...
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Some of the most well-known USGS maps are the 1:24,000-scale topographic maps, also called 7.5-minute quadrangles . In 2009, the USGS transitioned from our hand scribed historical topographic maps to US Topos , which are computer-generated on a regular schedule using national databases...
Since 1947, the primary USGS topographic map size has been the 7.5-minute quadrangle, so each side of the map is bound by 7.5 minutes of latitude and 7.5-minutes of longitude.
A quadrangle is defined by north and south boundaries of constant latitude (which are not great circles so are curved), and by east and west boundaries of constant longitude. From approximately 1947–1992, the USGS produced the 7.5 minute series, with each map covering an area one-quarter of the older 15-minute quad series, which it replaced ...
U.S. Geological Survey Scales. The U.S. Geological Survey (USGS) publishes maps at various scales. The scale used for most U.S. topographic mapping is 1:24,000. USGS maps at this scale cover an area measuring 7.5 minutes of latitude and 7.5 minutes of longitude and are commonly called 7.5-minute quadrangle maps.
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27 Οκτ 2019 · USGS 7.5-minute quadrangle maps that contain topographic change polygons. A total of 2,454 quadrangles contain change polygons, which represents over 4.5 percent of the quadrangles in the conterminous United States.
